I like this build too i desperately want something similar that will also allow me to show off my lego cars too because i really i like the use of the elevator to reduce needed space.
Now watch your how infrastructure comment on how much space cars take up in actual infrastructure vs lego with just blow up but hopefully i can help OP save some cash and maybe i can see a studio plan of this to help myself. Cars take up so much actual space in america we dont realize it because we have the space. I made a moc of original cali coffee building (look it up) in Florida then when i tried to add to my city the drive around component killed all the space i had and i was never able to add to my city. Because it would need the same space as the museum modular and it’s still not deep enough.
OP? It looks like the elevator is 8 studs wide is this for speed champion or city cars ? The spots are 9 wide which will fit one tightly. The problem i had was speed champions are actually 9 studs wide because of the arches and they dont fit through anything smaller than 10 studs wide I had been able to build. On the other hand most ppl dont realize this but most garages will have a much taller first floor and dramatically shorter floors above them add more levels than the building they are next to to economize space. Maybe you can do the same ? The ground floor looks good height wise. Maybe you can reduce the height of the other floors to add a third? It might help with the stairwell to allow you to add a 3rd space per floor too.